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Cons: Autofocus: It is very quick but when lock it hesitates with a jack-hammer like focus. Resulotion: Is not good a f/2.8 @ 70mm focal range where one will get the most bokeh for portraits. Flare & Ghosting: You have to be careful when shooting into any light source.

Pros: Build Quality: This lens was in a war zone; it should get a medal. Optical: Great for studio shooting at F/5.6 and above. Great for landscape/Urbanscape photography.

Summary: I you shoot landscape and studio photography and you don't shoot at f/2.8. I recommend this lens. If the f/2.8 is vital for you I would get something else. It is great value for money.

Cons: Not the sharpest at the edges when wide open, not really noticeable on a crop body, Heavy for a shorter range lens.

Pros: Solid build, great color and clarity when stopped down to f/4. Fast focusing and very quiet.

Summary: My most used lens for everything from weddings to landscape and even some live performance work.

Cons: the corners are not real sharp in infinity position I testet f 4,5 on 28mm:stong chromatic aberrations in the corners and double contures. not to use for big posters of architecture without intensive sharpening by photoshop because of these mistakes

Pros: stopped down a few quite good optical qualities in the center colors and cantrast really ok

Summary: For this high price I expect highest quality from f 2,8 and not middle quality up to f 8 My cheap soligor 3,5-4,5/28-70 is when stopped down to f4,5 much more sharper in the corners on 28mm. Too many plastic elements therein?

Cons: sharp,

Pros: good

Summary: yes yess

Cons: The zoom is a little stiff

Pros: Price

Summary: Great value for money. I use it on a Canon 5D Mk2 for low light work photographing bands on the local small club/bar scene and it is doing a great job.

Cons: very wide, frontfocus, no IS (noticeable in low f), heavy

Pros: very crisp, very good colors

Summary: Is a good lens, but a bit expensive.

Cons: Weight, Filter Size

Pros: Price, Comparison To Canon, and Image Quality Wide Open

Summary: Great Great Great Lens, Kinda The Same Performance As The Canon For Half The Price

Cons: My copy had a back focus issue of 50mm, which meant the main subjects emerged out of focus.

Pros: I returned the lens to Sigma, who fixed the problem and calibrated it to my SLR (which accompanied it) and returned both within 4 days. Image Quality is outstanding after f4 (On a DX). IQ is great from wide open as long as you know the limitations of the lens and how to frame your shots. 82mm filters expensive - however the Heliopan Polarizer mated to this lens produces stunning images in colour.

Summary: A wonderful piece of glass - once the back focus issue was resolved. Colour images (bright outdoor landscapes) with the heliopan 82mm polarizer are stunning. Fast AF, Great Build and Superb Value.

Cons: Big filter thread (82mm) Short zoom and focus ring AF speed slower that Nikon Lack NanoCrystal coating on front element Tad soft untill f/4, after f/4 = crisp

Pros: Compact Tightly fit lens hood Sharper than Canon Good performance in low light Internal focus (manual focus override)

Summary: Great lens, image quality lies between Nikon and Canon. Good for amateur, the pro please get the Nikon..huge difference

Cons: Corner performance is weak until about 7.1 -

Pros: Dazzling center performance at all apertures Nice build quality 82mm Filter size gives the lens a seriously professional look. HSM is as fast and as accurate as the USM in any Canon Excellent low light performance

Summary: If you want a solid alternative to the Canon 24-70MM L, look no further. The reality of photography is if the center performance is solid, the average client isn't going to scrutinize the corner performance of your photos. The Sigma 24-70 HSM has simply dazzling center performace, with mediocre edge performance until about 7.1, after that the edges (even on a full frame 5D) come into perfect focus. I've only had the lens for a few days, but used it at an event in low light - results were better than I expected! I waffled over this lens and the Canon for about a month and finally settled on the Sigma as it was $500 less and came with a 4 year warranty instead of Canon's 1 year warranty... Time will tell, but as of right now, I think I made the correct choice.